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Hanzo AI e9bef3383a Consolidate VMs into single chains module; cevm Metal anchor + V4 dispatch

VM consolidation (one module, one place only):
- Removed per-VM go.mod/go.sum/VERSION from {aivm,bridgevm,dexvm,evm,
  graphvm,identityvm,keyvm,oraclevm,quantumvm,relayvm,thresholdvm,zkvm}
- All VMs now compile under github.com/luxfi/chains root module
- aivm/, dexvm/, identityvm/, keyvm/, oraclevm/ factory.go + vm.go updated
  for AccelHost wiring

cevm Go-side (evm/cevm/):
- cevm.go, cevm_cgo.go, cevm_nocgo.go: ExecuteBlockV4(backend, threads,
  txs, ctx, state) with StateAccount snapshot
- cevm_secp256k1.go: BatchRecoverSenders Metal LDFLAGS
- cevm_secp256k1_metal_anchor_darwin.{c,go}: anchor to keep linker from
  dropping libsecp256k1_metal.a
- cevm_secp256k1_nocgo.go: stub for non-cgo builds
- plugin.go, fetch-luxcpp.sh, luxcpp-SHA256SUMS, LUXCPP_VERSION:
  pinned luxcpp consumption
- evm/cevm/parallel/parallel.go: BlockExecutor adapter calls
  cevm.ExecuteBlockV4 with state snapshot built from txs+statedb

Quantum/ZK witness:
- quantumvm/quasar_witness.go, zkvm/zwitness.go

go.mod: removed dead `replace github.com/ethereum/go-ethereum => luxfi/geth`
directive (caused dual-path conflict after math semver bump; no remaining
ethereum/go-ethereum imports in source). go mod tidy clean.

Tests: TestBatchRecoverSenders PASS through Metal anchor (cevm package).

2026-05-05 10:17:49 -07:00

1.6 KiB

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cevm — C++ EVM execution backend

The CGO bridge to the C++ EVM in ~/work/luxcpp/cevm. Selected at link time via build tags from chains/evm/backend_{cgo,nocgo}.go.

This is not a standalone VM. It is the GPU-accelerated execution backend for C-Chain when built with LUX_CGO=1. The pure-Go fallback (luxfi/geth) is used when LUX_CGO=0.

Layout

chains/evm/
├── main.go                 # luxd plugin entry
├── backend_cgo.go          # cgo backend selector (LUX_CGO=1)
├── backend_nocgo.go        # pure-Go selector (LUX_CGO=0)
└── cevm/                   # this package — C++ FFI shim
    ├── cevm.go             # Go API
    ├── cevm_cgo.go         # cgo bindings (linked against luxcpp libs)
    ├── cevm_nocgo.go       # no-op stubs for !cgo builds
    └── plugin.go           # plugin registration glue

Linking

cevm_cgo.go references ${SRCDIR}/../../../../luxcpp/... for headers and libs. From ~/work/lux/chains/evm/cevm/ that resolves to ~/work/luxcpp/. For module-cache builds, see accel's fetch-luxcpp.sh pattern (TODO: port the same approach here).

Performance

When CGO is enabled and luxcpp libs are available:

~3–5× the throughput of pure-Go EVM
SIMD opcode dispatch (AVX2/NEON)
GPU batch operations via Block-STM (CUDA/Metal)

Provenance

Folded into chains/evm from the previously-standalone luxfi/cevm repo on 2026-04-30. cevm is internal-only — no operator daemon. C-Chain runs in luxd. See ~/work/lux/chains/PLUGGABLE.md for the canonicalization pattern that governs the rest of the chain VMs.

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